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perplex +‎ -ity, from Middle French perplexité or post-classical Latin perplexitas ‘entanglement’, from perplexus.



perplexity (countable and uncountable, plural perplexities)

  1. The state or quality of being perplexed; puzzled or confused.
  2. Something that perplexes.
    • 1942, Rebecca West, Black Lamb and Grey Falcon (Canongate 2006), page 149:
      The Emperor, who was by then a focus of unresolvable perplexities, stood providing a strongly contrary appearance.
  3. In information theory, a measurement of how well a probability distribution or model predicts a sample.


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